Logo image
Back
One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption
Journal article   Open access   Peer reviewed

One-pot synthesis of Fe(III)-coordinated diamino-functionalized mesoporous silica: Effect of functionalization degrees on structures and phosphate adsorption

W-Y Huang, D. Li, J. Yang, Z-Q Liu, Y. Zhu, Q. Tao, Kai Xu, J-Q Li and Y-M Zhang
Microporous and Mesoporous Materials, Vol.170, pp.200-210
2013
DOI: https://doi.org/10.1016/j.micromeso.2012.10.027
pdf
diamino-functionalized_mesoporous_silica.pdfDownloadView
Author’s Version Open Access
url
Link to Published Version *Subscription may be requiredView

Abstract

Fe(III)-coordinated mesoporous silica adsorbents functionalized with different loadings of ethylenediamine groups were prepared by a new NH 4F-assisted co-condensation method and impregnation of Fe 3+ cations. Various characterization techniques, e.g. XRD, SEM, TEM, ICP-MS, elemental analysis, FT-IR spectroscopy, and nitrogen adsorption-desorption, were utilized to investigate the effect of functionalization degrees of adsorbents on their chemical composition, surface chemistry, pore structures and phosphate adsorption capacities in detail. In the batch adsorption tests, the functionalized adsorbents with increasing loadings of ethylenediamine groups possessed markedly enhanced adsorption capacities, although there was a gradual loss of ordered mesostructures accompanied. The adsorption isotherms were represented better by using Langmuir model than Freundlich model, which indicated the presence of monolayer adsorption. In particular, for the resulting adsorbent prepared with 0.5:1 M ratio of AAPTS and TEOS, the maximum phosphate capture capacity calculated from Langmuir model is 20.7 mg P/g. In the kinetic study, the phosphate adsorption followed pseudo-second-order equation well with a correlation coefficient of 0.999, suggesting the adsorption process be chemisorption. The phosphate adsorption efficiency of prepared adsorbent was highly pH-dependent and the high removal of phosphate was achieved within the pH between 3.0 and 6.0. The presence of Cl- and NO3 - exhibited small impacts on the phosphate adsorption by using our synthesized absorbent; whereas, there were significantly negative effects from HCO3 - and SO 4 2- on the phosphate removal. In 0.010 M NaOH, more than 90% of the absorbed phosphate anions on the spent adsorbent could be desorbed, suggesting the absorbent with a capacity of regeneration.

Details

UN Sustainable Development Goals (SDGs)

This output has contributed to the advancement of the following goals:

#6 Clean Water and Sanitation

Source: InCites

Metrics

422 File views/ downloads
107 Record Views
30 Times Cited - Web of Science

InCites Highlights

These are selected metrics from InCites Benchmarking & Analytics tool, related to this output

Collaboration types
Domestic collaboration
International collaboration
Citation topics
2 Chemistry
2.90 Water Treatment
2.90.27 Adsorption
Web Of Science research areas
Chemistry, Applied
Chemistry, Physical
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
ESI research areas
Materials Science
Logo image